Control of adult houseflies with 3-(4-halophenyl) - 3&#39; - trifluoromethyl-4&#39;-halo-5-halosalicylanilides



United States Patent ABSTRACT OF THE DISCLOSURE Compounds of the class 3-(4-halophenyl)-3'-trifluoromethyl-4'-halo-5-halosalicylanilide useful in the control of adult houseflies.

This invention relates to a method of destroying adult houseflies employing as the active agent a substituted 3-phenylsalicylanilide of the formula wherein A and B are halogen of atomic weight in the range of to 80 and wherein D is halogen of atomic weight in the range of 18 to 80, for example 4,5-dichloro-3'-trifluoromethyl-3- (4-chlorophenyl) salicylanilide,

4',5-dichloro-3'-trifluoromethyl-3- (4-bromophenyl) salicylanilide,

4'-bromo-5-ch1oro-3'-trifluoromethyl-3- (4-chlorophenyl) salicylanilide,

4'-fluoro-5-chloro-3 -trifluoromethyl-3- (4-chlorophenyl) salicylanilide,

4,5 -dibromo-3-trifluoromethy1-3-(4-chlorophenyl) salicylanilide,

and the like.

As illustrative of the preparation of these new adult housefly agents is the following:

Example I To a suitable reaction vessel equipped with a thermometer, agitator and reflux condenser is charged 14.1 parts by weight of 5-chloro-3-(4-chlorophenyl)salicylic acid and 111 parts by weight of chlorobenzene. The so-charg'ed mass is heated to about 70 C. and thereto is added with agitation 7.6 parts by weight of -3-trifiuoro-methyl-4-chloroaniline followed by 2.5 parts by weight of phosphorust'richloride. The mass is then heated to reflux (about 135 C.) and refluxed for about five hours. The reaction mass is then cooled to about 70 C. and thereto is added 50 parts by weight of water followed by 50 parts by weight of 20% hydrochloric acid. The mass is then permitted to stand for about 15 minutes, whereupon the organic layer is removed and washed first with water and then with dilute aqueous sodium bicarbonate and finally with water. The so-washed organic layer is then stripped of volatiles. The residue is then recrystallized from benzene to give 4',5 dichloro 3'-trifluoromethyl-3-(4-chlorophenyl)salicylanilide, M.P. 166-l69 C.

Example II Employing the procedure of Example I but replacing 3-trifluoromethyl-4-chloroaniline with an equimolecular amount of 3-trifluoromethyl-4fluoroaniline there is obtained 4'-fluoro-5'chloro-3'-trifluoromethyl-3-(4 chlorophenyl)salicylanilide, M.P. 145-147 C. i

In a similar manner to that of Example I the analogue 3',4',5 trichloro-3-(4-chlorophenyl)salicylanilide, M.P. l93-194 C., is prepared from 3,4-dichloroaniline and 5- chloro-3-(4-chlorophenyl)salicylic acid, and the analogue 3'-trifluoromethyl-5-chloro 3 (4-chl0rophenyl)salicyl anilide, M.P. 148149 C., from 3-trifluoromethylaniline and 5-ch1oro-3-(4-chlorophenyl)salicylic acid, and the analogue 4',5 dichloro-3-(4-chlorophenyl)salicylanilide, M.P. 173-174" C., from 4-chloroaniline and 5-chloro-3- (4-chlorophenyl)salicyclic acid.

As illustrative of the adult housefly activity of the compounds of this invention as compared to analogues thereof is the following:

A 1.0% by weight concentrate was prepared by dissolving the compound to be evaluated in 10 ml. of acetone. This solution was diluted with 90 ml. of water containing 0.01% of isooctylphenyl polyethoxyethanol nonionic surfactant. A syringe was filled with this mixture and placed in a microinjection apparatus. The injector level was pressed once to deliver one microliter which was applied directly to the thorax of one female adult fly, M. domestica, in a plastic tube. This procedure was conducted 5 times for each compound at the same concentration, which is one microgram per microliter. A period of 24 hours at room temperature was allowed to lapse after application and a count made to determine living and dead flies. The following results were obtained:

What is claimed is:

1. A method of destroying adult housefiies which comprises contacting same with a toxic amount of a substituted 3-phenylsalicylanilide of the formula .ULNHQD I OH wherein A and B are halogen of atomic weight in the range of 35 to and wherein D is halogen of atomic weight in the range of 18 to 80.

2. A method of destroying adult housefiies which comprises contacting same with a toxic amount of the substituted 3-phenylsalicylanilide of claim 1 wherein A, B and D, respectively are chloro.

3. A method of destroying adult houseflies which comprises contacting same with a toxic amount of the substituted 3-phenylsalicylanilide of claim 1 wherein A and B, respectively, are chloro and wherein D is fiuoro.

(References on following page) 3 4 References Cited ALBERT T. MEYERS, Primary Examiner.

UNITED STATES PATENTS S. I. FRIEDMAN, Assistant Examiner. 2,745,874 5/ 1956 Schetty et a1 260-553 3,216,896 11/1965 Early et a1. 16731 3,249,637 5/1966 US. Cl. X.R.

Early et a1. 260-559 5 424-324 

